Attachment for planer or similar machines



R. H. DAVIS. ATTACHMENT ron PLANER on SIMILAR MACHINES. APPLICATION FILED DEC.23| 1920.

1,388,853. Patented g 30, 1921.

2 SHEETS-SHEET l- R. H. DAVIS.

ATTACHMENT FOR PLANER 0R SIMILAR-MACHINES. APPLICATION FILED 050.23. 1920.

1,3 5 I Patented Aug. 30, 1921';

2 SHEETSSHEET 2.

I INVENTOR UNiTE. STATES RICHARD H. DAVIS, OF DAVENPORT, IOWA.

ATTACHMENT FOR PLANER OR SIMILAR MACHINES.

Specification of Letters Patent. P t t u 0 1921 Application filed December 23, 1920. Serial No. 432,880.

(FILED UNDER THE ACT OF MARCH 3, 1883, 22 STAT. L, 625.)

To a 10710771276 may concern:

Be it known that I, RICHARD H. DAVIS, a citizen of the United States, and a resident of Davenport, county of Scott, State of Iowa, have invented an Improvement in an Attachment for Planer or Similar Machines, of which the following is a specification.

The invention described herein may be used by the Government, or any of its ofiicers or employees in prosecution of work for the Government, or by any other person in the United States, without payment to me of any royalty thereon.

The subject of this invention is an attachment for a planer or similar machine.

The main object of the invention is the provision of means for automatically lifting the tool from contact with the work during return stroke. When using under-cutting tools, especially in deep cuts or slots this is especially desirable to prevent wear and breakage of the tools and injury to the work.

With these and other objects in view the invention resides in the novel arrangement and combination of parts and 1n the details of construction hereinafter described, and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed may be made within the scope of what is claimed without departing from the spirit of the invention.

One practical embodiment of the invention is' illustrated in the accompanying drawings, wherein:

Figure 1 is a view in side elevation partly in section, of the attachment showing a fragment of the bed plate of a planer and the frame in broken lines;

Fig. 2 is a perspective of the attachment; Fig. 3 is a similar view of the latching dog;

Fig. 4c is a similar view of the swinging arm.

Referring to the drawings by numerals of reference The side frame of the planer is shown in broken and dotted lines at 10 and the usual traveling bed plate of the planer is indicated at 11.

Secured to the frame of the planer are bracket arms 12 in which is journaled a rock shaft 13 extending transversely of the machine. An arm 14 is rigidly secured to the shaft 13 and extends forwardly therefrom and a chain or cable'depends from the forward end of this arm and has its lower end suitably connected to the clapper block 16 carrying the cutting tool 17.

An arm 18 is likewise rigidly secured to the shaft 13 and extends rearwardly thereof, and pivotally connected to this arm is the upper end of the rod 19 which is preferably provided with a turnbuckle 20 by which the length of the rod may be adjusted.

The lower end of the rod 19 has a pivotal connection with a latching arm 21 which is mounted on the side frame of the machine by a pivot pin 22. On the pin 22 is also mounted a swinging arm 23 formed with an offset upper end 24 to engage over the latch arm and force the same downwardly when/the arm 23 is swung in one direction. The lower end of the arm. 23 is formed with an angularly extending pin 25 upon which may be mounted a roller 26 adapted to be struck by an extending lug 27'of a trip block 28 which is secured to the side of the bed plate 11 near the forward end thereof.

The lug 27 strikes the roller 26 when the bed plate has reached the limit of the cutting stroke and swings the arm rearwardly, forcing the latching arm 21 downwardly, thereby exerting a pull on the rod 19, which, through the arm 18, rocks the shaft 13 causing an upward movement of the arm 14.- and pulling upon the chain 15 to lift the clapper block and the tool.

When the arm 21 is swung downwardly, as just described its free end is engaged by a gravity pawl or dog 29 which is mounted on a pivot pin 30 secured to the side frame of the machine.

The dog 29 is formed with a projecting lug 31 which is adapted to engage an arm 32, also mounted on the pivot pin 30, by which arm the dog is swung to unlatching position in the following manner:

An extension 33 projects at an angle from the arm 32 and is positioned to be struck by trip block 34: which is secured to the side of the bed plate near the rear end thereof and so positioned as to strike the extension 33 when the bed plate reaches the end of its return stroke. The block 841 is so proportioned that it will pass the end of the roller 26 and the )in 25 without contact therewith. When the b lock 3 1 contacts the extension 33, the arm 32 is swung into contact therewith.

When the block34 contacts the extension 33, the arm 32 is swung into contact with the lug 31 thereby swinging the contact 29 on the pivot pin 30 and releasing the latch arm 21.

When the latching arm is released the pull exerted by gravity upon the clapper block and tool will be suflicient to lower the tool to cutting position, thereby rocking the shaft 13 and restoring the parts to their original position.

Having described my invention what I claim as new and desire to secure by Letters Patent is y 1. An attachment for planing machines, including bracket arms, attachable to the frame of the machine, a rock shaft journaled in the arms, an arm rigidly secured to the shaft and extending forwardly therefrom, a chain depending from the arm and attachable to a clapper block, a second arm rigidly secured to the shaft and extending rearwardly therefrom, a connecting rod depending from the second arm and having pivotal connection therewith, a turn-buckle for adjusting the length of the rod, a latching bar to be pivotally mounted on the frame of the planer connected to the lower end of the rod, a swinging arm mounted on the same pivot as the latching bar and formed with a lug adapted to overlie and contact the latching bar and with an angularly disposed striker, a latching dog to be pivoted to the frame to engage the latching bar, a lug formed on the dog, an arm pivotally mounted on the pivot of the latching dog and adapted to contact its lug, said arm, formed with an angularly disposed striker pin, a block to be secured to the bed plate and adapted to strike the swinging arm at the end of a cutting stroke to throw the arm and latching bar, and a block to be secured to the bed plate and adapted to strike the arm associated with the dog when the bed plate reaches the limit of its return stroke to trip the dog and release the latching bar.

2. The combination with a planer including a clapper block and a bed plate, of a rock shaft mounted on the planer, an arm extending from the rock shaft, a connection between the arm and the clapper block, a second arm extending from the shaft, a latch bar pivotally connected to the planer, an adjustable connection between the second arm and the latching bar, a dog pivotally connected to the planer and adapted to engage the latch bar, a trip block carried by the bed plate to trip the latch bar into engagement with the dog at the end of the cutting stroke to rock the shaft and lift the clapper block and a trip block carried by the bed plate to trip the dog at the end of the return stroke to release the latch bar and also the clapper block.

3. The combination with a planer, including a bed plate, and a clapper block, of a rock shaft journaled on the planer, a connection between the rock shaft and the clapper block, a latch bar pivoted to the planer, a connection between the latching bar and the rock shaft, a dog for engagement with the latch bar pivoted to the planer, means carried by the planer to trip the latch bar to dog engaged position to lift the clapper block at the end of the cutting stroke and means carried by the planer to trip the dog and release the latch bar to lower the clapper block at the end of the return stroke.

4. The combination with a planer including a bed plate and a clapper block, of a latching bar pivoted to the planer, a connection between the latching bar and the clapper block, a dog pivoted to the planer to engage the latching bar, means carried by the planer to trip the latching bar to be engaged by the dog and lift the clapper block at the end of the cutting stroke and means carried by the planer to trip the dog and release the latching bar to lower the clapper block at the end of the return stroke.

RICHARD H. DAVTS. 

